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VOLUME 16 , ISSUE 8 ( August, 2015 ) > List of Articles


In vivo Evaluation of Proximal Resin Composite Restorations performed using Three Different Matrix Systems

Mateus Rodrigues Tonetto, Alvaro Henrique Borges, Leily Macedo Firoozmand, Etevaldo Matos Maia Filho, Matheus Coelho Bandeca, Rudys Rodolfo De Jesus Tavarez, Isabella Azevedo Gomes, Debora Castelo Branco Rios Mariz, Carlos Milton Kuga

Citation Information : Tonetto MR, Borges AH, Firoozmand LM, Filho EM, Bandeca MC, Tavarez RR, Gomes IA, Mariz DC, Kuga CM. In vivo Evaluation of Proximal Resin Composite Restorations performed using Three Different Matrix Systems. J Contemp Dent Pract 2015; 16 (8):643-647.

DOI: 10.5005/jp-journals-10024-1735

Published Online: 01-08-2015

Copyright Statement:  Copyright © 2015; The Author(s).



The aim of this in vivo study was to radiographically evaluate the proximal contour of composite resin restorations performed using different matrix systems.

Materials and methods

Patients with premolars needing class II type resin composite restorations involving the marginal ridge were selected. Thirty premolars were selected and randomly divided into three groups (n = 10 each) to receive restorations using different matrix systems: group 1: metal matrix coupled to a carrier matrix and wood wedge (G1-MMW); group 2: sectioned and precontoured metal matrix and elastic wedge (G2-SME); and group 3: a polyester strip and reflective wedge (G3-PMR). After the restorative procedure, bitewing radiographs were performed and analyzed by three calibrated professionals. The quality of the proximal contact and marginal adaptation of the proximal surfaces was classified as either correct or incorrect (undercontour/overcontour).


The Pearson Chi-square statistical test (α = 5%) revealed a statistically difference between frequencies of correct and incorrect restorations (α2 = 6.787, p < 0.05). The group G2 SME produced a higher frequency of correct proximal contours (90%), while G1-MMW and G3-PMR had a ratio of 40% correct and 60% incorrect contours respectively.


None of the matrix systems was able to prevent the formation of incorrect proximal contours; however, the sectioned and precontoured metal matrix/elastic wedge configuration provided better results as compared to the other groups.

How to cite this article

Gomes IA, Filho EMM, Mariz DCBR, Borges AH, Tonetto MR, Firoozmand LM, Kuga CM, De Jesus RRT, Bandéca MC. In vivo Evaluation of Proximal Resin Composite Restorations performed using Three Different Matrix Systems. J Contemp Dent Pract 2015;16(8):643-647.

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